CN102355738B - Cognitive SIMO (Single Input Multiple Output) network access method on basis of cooperative relay - Google Patents

Cognitive SIMO (Single Input Multiple Output) network access method on basis of cooperative relay Download PDF

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CN102355738B
CN102355738B CN201110178680.2A CN201110178680A CN102355738B CN 102355738 B CN102355738 B CN 102355738B CN 201110178680 A CN201110178680 A CN 201110178680A CN 102355738 B CN102355738 B CN 102355738B
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CN102355738A (en
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吴启晖
王金龙
杨旸
张玉明
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PLA University of Science and Technology
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/026—Co-operative diversity, e.g. using fixed or mobile stations as relays

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Abstract

The invention relates to a cognitive SIMO (Single Input Multiple Output) network access method on the basis of a cooperative relay, which comprises the following steps of: cognizing channel response in a base station collecting network; judging whether a cognitive user can cooperate with a master user to carry out communication so as to achieve a target transmission rate required by the master user; if the cognitive user can cooperate with the master user to carry out communication, cognizing that an SIMO network is accessed into an authorized frequency band of the master user; and if the cognitive user cannot cooperate with the master user to carry out communication, ensuring the SIMO network not to be accessed into the authorized frequency band of the master user. The access mode can ensure a plurality of cognitive users and the master user to simultaneously use the same authorized frequency spectrum to carry out communication at the same geographical position on the premise of ensuring the target transmission rate of the master user, so that the utilization rate of the frequency spectrum is improved as further as possible. The access mode is on the basis of the cognitive communication, so the shorter the distance between a cognition network and a master user network is, the higher the network throughput which can be achieved by the access mode is. Moreover, the large-range network covering can be realized and the defects of the existing cognitive radio access mode are overcome.

Description

Based on the cognitive SIMO method for network access of cooperative relaying
Technical field
The invention belongs to cognitive radio technology field, a kind of new cognitive list that is applied to is inputted the cognitive radio access way based on cooperative relaying in many output (Single-Input Multiple-Output is called for short SIMO) network specifically.
Background technology
Cognitive radio is one of at present the most popular wireless technology, its appearance has changed the frequency spectrum usage mode that frequency spectrum resource is exclusively enjoyed by authorized user, the cognitive user that has cognitive radio function can be carried out interactive perception by the wireless communications environment that it is worked, automatically change the sending and receiving parameter of self, under the prerequisite that guarantees authorized user (primary user) proper communication, dynamically reuse mandate frequency range, thereby can improve significantly the availability of frequency spectrum.In addition, many antennas are acknowledged as one of essential technical scheme of following high speed wireless data Access Network.Multiple antenna communication has increased Spatial Dimension on the basis of the three dimensional resource in original frequency domain, time domain and code territory, by advanced signal processing technology when empty, can not increase on the basis of bandwidth and transmitting power, promote exponentially the capacity of wireless communication system, can also strengthen anti-interference of communication system, anti fading performance, thereby effectively alleviate frequency spectrum anxiety and high speed business support is provided simultaneously.The same effective means as improving the availability of frequency spectrum, the combination of multi-antenna technology and cognitive radio technology has very wide application prospect.
Mainly there are two kinds of modes in cognitive radio insertion authority frequency range at present: the access of chance formula frequency spectrum and the frequency spectrum share based on " interference temperature " based on " frequency spectrum hole ".
Chance formula frequency spectrum access based on " frequency spectrum hole ": the frequency spectrum resource not used by primary user in specific specific geographical position of time is called " frequency spectrum hole ", the access of chance formula frequency spectrum is exactly to utilize these frequency spectrum holes to communicate, and it is that cognitive radio is the most directly conceived.This access way need to not carried out transmitting power control for primary user, but require cognition network to have high-precision frequency spectrum detection technology, when the heavy traffic of primary user's network, adopts the access of chance formula frequency spectrum to be difficult to obtain communication opportunity.
Based on the frequency spectrum share of " interference temperature ": interference temperature is defined in the receiving radio frequency front end of wireless device, be used for measuring in a certain geographical position the received interference size of a certain frequency band inner receiver, the patient maximum interference temperature of receiver proper communication is called interference temperature circle.As long as cognition network can by own to the interference of primary user's receiver, be controlled at interference temperature circle within, just can be in the situation that not affecting primary user's proper communication use authority frequency range.Utilize this access way, cognition network can be used identical mandate frequency range to communicate by letter simultaneously in same geographical position with primary user, but must control to meet to the transmitting power of cognition network primary user's interference temperature circle, therefore frequency spectrum share mode cannot realize the large-scale network coverage, and and primary user's network distance when nearer communication performance very poor.
Summary of the invention
The object of the invention is the existing access difficulty of mode and the poor problem of communicating by letter for existing cognitive radio insertion authority frequency range, for the up link of many antennas cognition network is that cognitive SIMO network provides a kind of new access scheme based on cooperative relaying.This access way based on collaborative can be used with primary user identical mandate spectrum communication simultaneously in same geographical position, can realize the large-scale network coverage simultaneously, and can obtain good network throughput performance when nearer with primary user's network distance, made up the deficiency of existing cognitive radio access way.
The present invention is achieved by the following technical solutions:
A kind of cognitive SIMO method for network access based on cooperative relaying, channel response in the collection network of cognitive base station, judge whether cognitive user can work in coordination with primary user and communicate by letter to reach the required target transmission speed of primary user, if can, cognitive SIMO network insertion primary user's mandate frequency range; If cannot, do not access; It comprises the following steps:
Step 1, the collaborative solicited message of primary user's transmitter broadcasts (Cooperation Request Message is called for short CRM), the M dimension channel response vector h of primary user's transmitter to cognitive base station estimated in cognitive base station from the CRM receiving pb, each cognitive user is estimated the channel response of primary user's transmitter to c cognitive user from the CRM receiving
Figure GDA0000408003690000024
c=1,2 ..., N, meanwhile, cognitive base station obtains primary user's target transmission speed R from CRM pk, each cognitive user will
Figure GDA0000408003690000025
estimated value be sent to cognitive base station;
Wherein M represents the number of antennas of cognitive base station configuration, and N represents the number of cognitive user in cognition network;
Step 2, primary user's receiver is made response to CRM, reply collaborative response message (Cooperation Acknowledge Message, be called for short CAM) to primary user's transmitter, each cognitive user estimates that according to the CAM receiving it arrives the channel response of primary user's receiver
Figure GDA0000408003690000026
c=1,2 ..., N;
Step 3, cognitive base station judge that the whether capable collaborative primary user of cognitive SIMO network communicates by letter to reach primary user's target transmission speed:
First, whether own the and each cognitive user of cognitive base station judgement can decoding success primary user data
(a) if the data rate that cognitive base station obtains is greater than primary user's target transmission speed, i.e. condition
Figure GDA0000408003690000021
meet, cognitive base station can decoding success primary user data, wherein p prepresent the transmitting power of primary user's transmitter,
Figure GDA0000408003690000027
represent the channel noise power that cognitive base station receives;
(b) if the message transmission rate that c cognitive user obtains is greater than primary user's target transmission speed, i.e. condition
Figure GDA0000408003690000022
meet, c cognitive user can decoding success primary user data, and c cognitive user is included into and gathers U 1, otherwise be included into set U 2, wherein
Figure GDA0000408003690000023
represent the channel noise power that c cognitive user receives, set U 1expression can decoding success primary user data the set of cognitive user, set U 2expression can not decoding success primary user data the set of cognitive user;
Now, if set U 1in cognitive user can provide its required target transmission speed, i.e. condition for primary user
Figure GDA0000408003690000031
can meet, simultaneously cognitive base station can decoding success primary user data, and cognitive SIMO network can access primary user's mandate frequency range, now, cognitive base station sends collaborative confirmation (Cooperative Confirmation Message is called for short CCM) to primary user
Otherwise cognitive SIMO network does not access primary user's mandate frequency range; Wherein
Figure GDA0000408003690000032
represent the channel noise power at primary user's receiver place, p c, maxrepresent the peak transmitted power that c cognitive user allows.
In the present invention, cognitive base station sends after collaborative confirmation CCM to primary user, comprises two steps:
Step 1, cognitive base station and each cognitive user receive primary user's data: primary user's transmitter and receiver has received after CCM, starts to carry out data transmission, and cognition network keeps mourning in silence, and receives primary user's data message, cognitive base station and set U 1in cognitive user primary user's data are carried out to decoding.
Step 2, cognitive user send its data, simultaneously relaying primary user data: cognitive SIMO network receives after primary user's data, set U 1in cognitive user use data that own part transmitting power sends oneself to cognitive base station, remainder power forwarding primary user data to primary user's receiver to meet primary user's target transmission speed; Set U 2in cognitive user do not forward primary user's data, use data that whole transmitting powers send oneself to cognitive base station.The interference of primary user's data is eliminated in cognitive base station from the mixed signal receiving, and disturbs after elimination, and the data of each cognitive user receiving are carried out to wave beam formation.
The present invention has advantages of following with respect to prior art:
The present invention has designed a kind of cognitive SIMO network access mode based on cooperative relaying, this mode can guarantee under the prerequisite of primary user's target transmission speed, make multiple cognitive user use identical mandate frequency spectrum to communicate in same geographical position and primary user simultaneously, thereby improved the availability of frequency spectrum as much as possible.Because this access way is based on communication for coordination, cognition network and primary user's network distance are nearer, and its network throughput that can reach is larger, and can realize the large-scale network coverage, has made up the deficiency of existing cognitive radio access way.
Accompanying drawing explanation
Fig. 1 is the flow chart of the cognitive SIMO network access mode based on cooperative relaying in the present invention.
Embodiment
Example of the present invention is described as follows, and system emulation adopts MatLab emulation, and setting parameter does not affect generality.Primary user's system comprises the sender of 1 single antenna and the receiver of 1 single antenna, and receiver is randomly dispersed on the circumference take sender as center of circle radius as 200m; Cognition network comprises cognitive base station and 3 cognitive user of antenna more than 1, and 3 cognitive user are evenly distributed on the circumference take base station as center of circle radius as 200m at random.The large scale path loss of channel is carried out to modeling with logarithm path loss model, fissipation factor is made as 4; The Rayleigh that is 1 by average decline model carries out modeling to the multipath fading of channel; The noise power at receiver place is made as
Figure GDA0000408003690000041
the transmitting power of primary user's transmitter is 0dBm; 3 cognitive user have identical peak transmitted power p 1, max=p 2.max=p 3, max=20dBm; The number of antennas of cognitive base station is made as M=3; Distance between cognitive base station and primary user's transmitter is made as 100m.
Below take once independently random experiment as the detailed process of example explanation embodiment.In this random experiment,
Step 1. primary user transmitter broadcasts is worked in coordination with solicited message CRM, and cognitive base station and each cognitive user keep mourning in silence, and estimate the channel response vector h of primary user's transmitter to cognitive base station from the CRM receiving pb, primary user's transmitter is to the channel response of each cognitive user
Figure GDA0000408003690000042
and primary user's target transmission speed R pk=1bps/Hz.Each cognitive user will
Figure GDA0000408003690000043
estimated value report cognitive base station.
Step 2. primary user receiver is made response to CRM, replys collaborative response message CAM to primary user's transmitter, and cognitive base station and each cognitive user keep mourning in silence, and each cognitive user estimates that according to the CAM receiving it arrives the channel response of primary user's receiver
Figure GDA0000408003690000044
In this random experiment, according to supposed path loss and path fading model, use the Matlab simulation software above channel response of random generation to be:
h pb = [ 1,1967 × 10 - 4 , 1.117 × 10 - 5 , 1.1488 × 10 - 4 ] T
h 1 pc = 2.9093 × 10 - 5 , h 2 pc = 2.6325 × 10 - 5 , h 3 pc = 1.7732 × 10 - 5 ,
h 1 cp = 1.535 × 10 - 5 , h 2 cp = 1.8538 × 10 - 5 , h 3 cp = 1.167 × 10 - 5
The cognitive base station of step 3. judges that the whether capable collaborative primary user of cognition network communicates by letter to reach primary user's target transmission speed.
First, whether own the and each cognitive user of cognitive base station judgement can decoding success primary user data.If condition
Figure GDA0000408003690000048
meet, represent that the obtainable transmission rate in cognitive base station is greater than primary user's target transmission speed, so cognitive base station can decoding success primary user data, can judge, in this random experiment, cognitive base station can decoding success primary user data; If condition
Figure GDA0000408003690000049
meet, represents that transmission rate that c cognitive user obtains is greater than primary user's target transmission speed, so c cognitive user can decoding success primary user data, and c cognitive user is included into and gathers U 1, otherwise be included into set U 2, can judge, in this random experiment, 3 cognitive user can decoding success primary user data, therefore U 1={ 1,2,3}, U 2for empty set; If condition
Figure GDA0000408003690000051
can meet, represent that cognition network can provide its required target transmission speed for primary user, can judge, in this random experiment, this condition meets, simultaneously cognitive base station also can decoding success primary user data, so cognitive base station sends collaborative confirmation CCM to primary user, agree to help primary user's forwarding data.
The cognitive base station of step 4. and each cognitive user receive primary user's data: primary user's transmitter and receiver has received after CCM, starts to carry out data transmission, and cognition network keeps mourning in silence, and receives primary user's data message, cognitive base station and set U 1in cognitive user primary user's data are carried out to decoding.In this random experiment, cognitive base station and 3 cognitive user are all carried out decoding to primary user's data.
Step 5.: cognitive user sends its data, simultaneously relaying primary user data: cognitive SIMO network receives after primary user's data, set U 1in cognitive user use data that own part transmitting power sends oneself to cognitive base station, remainder power forwarding primary user data to primary user's receiver to meet primary user's target transmission speed; Set U 2in cognitive user do not forward primary user's data, use data that whole transmitting powers send oneself to cognitive base station; The interference of primary user's data is eliminated in cognitive base station from the mixed signal receiving, and disturbs after elimination, and the data of each cognitive user receiving are carried out to wave beam formation.

Claims (2)

1. the cognitive SIMO method for network access based on cooperative relaying, it is characterized in that the channel response in the collection network of cognitive base station, judge whether cognitive user can work in coordination with primary user and communicate by letter to reach the required target transmission speed of primary user, if of course, cognitive SIMO network insertion primary user's mandate frequency range; If cannot, do not access; It comprises the following steps:
step 1,primary user's transmitter broadcasts is worked in coordination with solicited message CRM, and cognitive base station estimates that from the CRM receiving primary user's transmitter is to cognitive base station
Figure 645578DEST_PATH_IMAGE002
dimension channel response vector
Figure 75423DEST_PATH_IMAGE004
, each cognitive user is estimated primary user's transmitter to the from the CRM receiving
Figure 785890DEST_PATH_IMAGE006
the channel response of individual cognitive user
Figure 654489DEST_PATH_IMAGE008
, meanwhile, cognitive base station obtains primary user's target transmission speed from CRM
Figure 766801DEST_PATH_IMAGE010
, each cognitive user will
Figure 695443DEST_PATH_IMAGE012
estimated value be sent to cognitive base station;
Wherein
Figure 893206DEST_PATH_IMAGE002
represent the number of antennas of cognitive base station configuration,
Figure 972020DEST_PATH_IMAGE014
represent the number of cognitive user in cognition network;
step 2,primary user's receiver is made response to CRM, replys collaborative response message CAM to primary user's transmitter, and each cognitive user estimates that according to the CAM receiving it arrives the channel response of primary user's receiver
Figure 63473DEST_PATH_IMAGE016
, and will estimated value is sent to cognitive base station;
step 3,cognitive base station judges that the whether capable collaborative primary user of cognitive SIMO network communicates by letter to reach primary user's target transmission speed:
First, whether own the and each cognitive user of cognitive base station judgement can decoding success primary user data;
(a) if the data rate that cognitive base station obtains is greater than primary user's target transmission speed, i.e. condition
Figure 254600DEST_PATH_IMAGE020
meet, cognitive base station can decoding success primary user data, wherein
Figure 730581DEST_PATH_IMAGE022
represent the transmitting power of primary user's transmitter,
Figure 551906DEST_PATH_IMAGE024
represent the channel noise power that cognitive base station receives;
(b) if
Figure 494455DEST_PATH_IMAGE006
the message transmission rate that individual cognitive user obtains is greater than primary user's target transmission speed, i.e. condition meet the
Figure 415323DEST_PATH_IMAGE006
individual cognitive user can decoding success primary user data, and by
Figure 887893DEST_PATH_IMAGE006
individual cognitive user is included into set
Figure 594818DEST_PATH_IMAGE028
, otherwise be included into set
Figure 988890DEST_PATH_IMAGE030
, wherein
Figure 213198DEST_PATH_IMAGE032
represent the
Figure 868170DEST_PATH_IMAGE006
the channel noise power that individual cognitive user receives, set
Figure 621362DEST_PATH_IMAGE028
expression can decoding success primary user data the set of cognitive user, set
Figure 33889DEST_PATH_IMAGE030
expression can not decoding success primary user data the set of cognitive user;
Now, if set
Figure 655363DEST_PATH_IMAGE028
in cognitive user can provide its required target transmission speed, i.e. condition for primary user
Figure 305788DEST_PATH_IMAGE034
can meet, simultaneously cognitive base station can decoding success primary user data, and cognitive SIMO network can access primary user's mandate frequency range, and cognitive base station sends collaborative confirmation CCM to primary user;
Otherwise cognitive SIMO network does not access primary user's mandate frequency range; Wherein
Figure 495460DEST_PATH_IMAGE036
represent the channel noise power at primary user's receiver place,
Figure 988759DEST_PATH_IMAGE038
represent the
Figure 23711DEST_PATH_IMAGE006
the peak transmitted power that individual cognitive user allows.
2. the cognitive SIMO method for network access based on cooperative relaying according to claim 1, is characterized in that described cognitive base station sends after collaborative confirmation CCM to primary user, comprises two steps:
step 1,cognitive base station and each cognitive user receive primary user's data: primary user's transmitter and receiver has received after CCM, starts to carry out data transmission, and cognition network keeps mourning in silence, and receives primary user's data message, cognitive base station and set
Figure 325379DEST_PATH_IMAGE028
in cognitive user primary user's data are carried out to decoding;
step 2,cognitive user sends its data, simultaneously relaying primary user data: cognitive SIMO network receives after primary user's data, set
Figure 279429DEST_PATH_IMAGE028
in cognitive user use data that own part transmitting power sends oneself to cognitive base station, remainder power forwarding primary user data to primary user's receiver to meet primary user's target transmission speed; Set
Figure 666548DEST_PATH_IMAGE030
in cognitive user do not forward primary user's data, use data that whole transmitting powers send oneself to cognitive base station; The interference of primary user's data is eliminated in cognitive base station from the mixed signal receiving, and disturbs after elimination, and the data of each cognitive user receiving are carried out to wave beam formation.
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Application publication date: 20120215

Assignee: Hainan Bao Tong industrial corporation

Assignor: Univ. of Science and Engineering, PLA

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Denomination of invention: Cognitive SIMO (Single Input Multiple Output) network access method on basis of cooperative relay

Granted publication date: 20140507

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Record date: 20160504

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